Biogas and CH4 productivity by co-digesting swine manure with three crop residues as an external carbon source

Xiao Wu, Wanying Yao, Jun Zhu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Co-digesting swine manure with three agricultural residues, i.e., corn stalks, oat straw, and wheat straw, to enhance biogas productivity was investigated in this study. A 3 x 3 experimental design with duplicates was adopted (3 crop residues x 3 carbon/nitrogen ratios) to examine the improvement of batch digestion in terms of biogas volume produced, CH4 content in the biogas, and net CH4 volume. The crop residues were first cut into small sections and then ground into fine particles smaller than 40 mesh size (0.422 mm) before being added to digesters. All the digesters were run simultaneously under controlled temperature at 37 ± 0.1°C. The length of experiment was 25 days. The results showed that all crop residues significantly increased biogas production and net CH4 volume at all C/N ratios, among which corn stalks performed the best with increase in daily maximum biogas volume by 11.4-fold as compared to the control, followed by oat straw (8.45-fold) and wheat straw (6.12-fold) at the C/N ratio of 20/1, which was found to be the optimal C/N ratio for co-digestion in the present study. In addition, corn stalks achieved the highest CH4 content in the biogas (∼68%), which was about 11% higher than that of oat straw (∼57%), whereas wheat straw and the control both had produced biogas with ∼47% CH4 content. Wheat straw demonstrated a lower biogas productivity than corn stalks and oat straw even it had a higher carbon content (46%) than the latter two residues (39%).

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2010, ASABE 2010
PublisherAmerican Society of Agricultural and Biological Engineers
Pages1091-1104
Number of pages14
ISBN (Print)9781617388354
StatePublished - 2010

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2010, ASABE 2010
Volume2

Bibliographical note

Funding Information:
The authors wish to thank the Initiative of Renewable Energy and Environment of the University of Minnesota for funding this project (Project#: D5e-2006).

Keywords

  • Biogas production
  • C/N ratios
  • Co-digestion
  • Crop residues
  • Swine manure

Fingerprint

Dive into the research topics of 'Biogas and CH4 productivity by co-digesting swine manure with three crop residues as an external carbon source'. Together they form a unique fingerprint.

Cite this